feat/add k-mers counter

k-mers_counter.md

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+# K-mers Counter
+
+```python
+def k_mer_counter(dna_seqs, k):
+    k_mers = {}
+    for heading in dna_seqs.keys():
+        sequence = dna_seqs[heading]
+        stop = k
+        for start in range(len(sequence)):
+            if stop <= len(sequence):
+                k_mer = sequence[start:stop]
+                stop += 1
+                if k_mer not in k_mers.keys():
+                    k_mers[k_mer] = 1
+                else:
+                    k_mers[k_mer] += 1
+
+    original_count = 0
+    repetitive_count = 0
+    for count in k_mers.values():
+        if count == 1:
+            original_count += 1
+        else:
+            repetitive_count += 1
+
+    return f"Sequences contain {original_count} original {k_input}-mer(s) and {repetitive_count} repetitive {k_input}-mer(s)"
+
+dna_seqs = {1:"atatacta", 2:"tgcacaca"}
+k_mer_counter(dna_seqs, 8)
+```